题干
Jack _____dislike the weather in Beijing in spring, because there is so much wind and sand. But now he ______.
A：is used to; used to
B：used to; is used to
C：was used to
D：used to; uses to
答案(点此获取答案解析）
B
在R上可导，且
，则
与
的大小是（ ）